New Functionality in Version 4.3a

New Physics and Features

Film Resistance is now available in the Electrolyte-Electrode Boundary Interface
and Electrolyte-Electrode Domain Interface features in all Electrochemistry physics
(except Primary Current Distribution and Electrode, Shell).

New Separator domain node in Tertiary Current Distribution, Nernst-Planck
physics.

New liion.cs_average/batbe.cs_average variable introduced, defined by the
porous electrode node in the Lithium-Ion Battery and Battery with Binary
Electrolyte Interfaces. The variable represents the average solid particle
concentration in the electrode particles.

General Improvements and Corrections

The governing equations for the Porous Electrode feature in Tertiary Current
Distribution, Nernst-Planck have been corrected. The time derivative is now
multiplied by the electrolyte volume fraction. Also the reaction sources of the
Reaction feature are multiplied by the electrolyte volume fraction (that is, implying
that the sources correspond to reactions taking place in the fluid phase only).
Models created prior to 4.3a with nonunity electrolyte volume fractions will render
different results compared to 4.3.

In the Lithium Ion Battery and the Battery with Binary Electrolyte physics
interfaces the transport number variable (tplus) is now correctly assigned to the
value in the Materials node, if From material has been chosen for this parameter. The
Batteries And Fuel Cells material library value for tplus for the three lithium-ion
electrolytes has been changed to 0.363. A space-dependent tplus is now
supported.

Updated Model

SEI layer resistance increase has been added to the “Capacity Fade of a Li-ion
Battery” (capacity_fade) model.

Backward Compatibility vs. 4.3

Brinkman Equations and Free and Porous Media Flow

The momentum equations in the Brinkman Equations interface and the Free and
Porous Media Flow interface have been corrected. The term -Qbr·u/εp2
in the right
hand side previously lacked the factor 1/εp2
, where εp is the porosity.

Reacting Flow Interface Name Change

The Reacting Flow interfaces have been renamed Reacting Flow in Porous Media.
Opening a model using either the Reacting Flow, Diluted Species or the Reacting
Flow, Concentrated Species interface, the interface is renamed Reacting Flow in
Porous Media.

Weak Constraints Update for Fluid Flow Interfaces

The weak constraint formulation for some boundary conditions in the following
interfaces have been updated:

Laminar Flow

Brinkman Equations

Free and Porous Media Flow

See CFD Module for details.

Mobility

In physics user interfaces modeling migration (Transport of Diluted Species, Transport
of Concentrated Species, Reacting Flow in Porous Media, Diluted Species, Reacting
Flow in Porous Media, Concentrated Species, Tertiary Current Distribution, and
Nernst-Planck) anisotropic mobility is now supported, and the mobility can be set to
following the Nernst-Einstein relation. The default setting when making new models
has been changed to use the Nernst-Einstein relation. Model Java-files generated prior
to 4.3a using Migration will have to be modified manually to account for these
changes.